What is Johannesburg UV index today?
Consult Johannesburg UV index today to determine whether the sun exposure is safe or if precautions should be taken.
Johannesburg Current UV Index
3.3538
UV Index Datetime
2024-12-26 14:13:38
Johannesburg Max UV Index
14.7668
Max UV Index Datetime
2024-12-26 10:09:39
City
Johannesburg
Country
South-Africa
Latitude
-26.2044
Longitude
28.0456
Today's max Johannesburg UV index is extreme, measuring 14.7668 around 2024-12-26T10:09:39.886Z. It is crucial to avoid sun exposure, seek shade, and wear comprehensive sun protection including clothing, sunscreen, and a hat.
Current Johannesburg Ultra Violet index is moderate, scoring 3.3538. Protect your skin during midday hours; wearing a hat and applying sunscreen is advisable.
What's the uv right now in Other Cities of South-Africa (Today UV Rays)
Johannesburg Real-Time UV Index Forecast Chart (Hourly Johannesburg UV Index Chart)
Explore Johannesburg UV Index Forecast Chart for next hours to stay informed about the varying levels of ultraviolet radiation index throughout the day
Safe Exposure Time Calculation in (Time to Burn Chart)
The most commonly used scheme to classify a person’s skin type by their response to sun exposure in terms of the degree of burning and tanning was developed by Thomas B. Fitzpatrick, MD, PhD. As a meter of fact even the skin color of Emoji characters based on the Fitzpatrick scale.
| Skin Type | Color | Typical Features | Tanning Ability | Time to Burn (minutes) |
|---|---|---|---|---|
| I | Red or blond hair; light-colored eyes; freckles likely | Always burns, does not tan | 49.69 | |
| II | Light eyes; light hair | Burns easily, tans poorly | 59.63 | |
| III | Any eye or hair color (very common skin type) | Tans after initial burn | 79.51 | |
| IV | Dark brown hair; medium to heavy pigmentation | Burns minimally, tans easily | 99.39 | |
| V | Dark hair; rarely sun sensitive | Rarely burns, tans darkly easily | 159.02 | |
| VI | N/A | Never burns, always tans darkly | 298.17 |
Ultraviolet Radiation Reflection from Surfaces
Highly reflective surfaces can increase surrounding levels of solar UV including concrete, snow, glass, water and polished metals (see source).
Reflected UV Levels
| Material | Reflected Solar UV Rays (%) | Effective UV Index | UV Color |
|---|---|---|---|
| New black roadway (Asphalt) | 4.1% | 3.49 | |
| Old grey roadway (Asphalt) | 8.9% | 3.65 | |
| Footpath (Concrete) | 10.1% | 3.69 | |
| Grasslands (Grass) | 1.2% | 3.39 | |
| Lawn (Grass) | 3.5% | 3.47 | |
| Fiberglass boat deck | 9.1% | 3.66 | |
| White house paint | 22% | 4.09 | |
| Wet beach sand | 7.1% | 3.59 | |
| Dry beach sand | 16.5% | 3.91 | |
| Clay/humus (Soil) | 5% | 3.52 | |
| Open water | 3.3% | 3.46 | |
| Open ocean | 8% | 3.62 | |
| Sea surf/white foam | 27.5% | 4.28 | |
| Snow old/new | 69% | 5.67 | |
| Wood boat deck | 6.6% | 3.58 |
Required Sunlight Exposure for Vitamin D in Johannesburg
Vitamin D is a hormone that controls calcium levels in the blood. It is needed to develop and maintain healthy bones, muscles and teeth and is also important for general health. The human body can get vitamin D in two ways: diet or sun exposure.
Minutes for sunlight exposure for sufficient Vitamin D intake (see source).
| Skin Type | Exposure Time (Johannesburg Current UV Level: Moderate) |
|---|---|
| I | 10-15m |
| II | 15-20m |
| III | 20-30m |
| IV | 30-40m |
| V | 40-60m |
| VI | 60-80m |
Johannesburg Historical UV Index Trends Over the Past Year (Monthly Johannesburg UV Index Chart)
This chart presents a detailed view of the UV rating index fluctuations throughout the past year, enabling you to identify the months with lower UV levels. By observing the monthly UV trends, you can determine the safer periods for outdoor activities with reduced risk of harmful UV exposure. It's a practical tool for planning outdoor ventures while prioritizing skin health and safety.
Downlaod Johannesburg historical UV index chart PDF of 2023
Downlaod Johannesburg historical UV index chart PDF of 2022
Downlaod Johannesburg historical UV index chart PDF of 2021
Frequently Asked Questions About Johannesburg UV Index
Find here the most frequent questions while enriching your knowledge.
The maximum UV Index in Johannesburg was 14.6176, typically reaches its peak during the Winter months. The UV Index measures the strength of sunburn-producing ultraviolet radiation. In Johannesburg, the highest UV Index can often reach levels considered "very high" or "extreme," which usually means a UV Index of 8 or more. This high index calls for extra precautions, like using sunscreen, wearing protective clothing, and avoiding prolonged sun exposure during midday hours.
In Johannesburg, the highest average UV Index is usually recorded in the month of January with the uv index of 14.477566666667. During this time, the combination of longer daylight hours and the sun's higher position in the sky contributes to stronger UV radiation. Residents and visitors should be particularly vigilant about sun protection during this month, as the UV rays are at their most intense, increasing the risk of sunburn and skin damage.
